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大円

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The two points P and P' (red) are antipodal because they are ends of a diameter PP', a segment of the axis a (purple) passing through the sphere's center O (black). P and P' are the poles of a great circle g (green) whose points are equidistant from each (with a central right angle). Any great circle s (blue) passing through the poles is secondary to g.

対蹠点（たいせきてん）とは球面上における正反対の点とその数学的性質

対蹠点球幾何学大円ボルスク・ウラムの定理
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